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Focusing probe for metal component eddy current defect detection and using method thereof

A defect detection and focusing probe technology, applied in the field of focusing probes, to achieve the effect of high detection sensitivity and great application value

Active Publication Date: 2021-09-03
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problem of effective detection of local corrosion defects and thickness of stainless steel plate under large lift-off conditions, and solve the problem of pulse eddy current detection of local defects of metal components and accurate positioning of defects under the condition of coating

Method used

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  • Focusing probe for metal component eddy current defect detection and using method thereof
  • Focusing probe for metal component eddy current defect detection and using method thereof
  • Focusing probe for metal component eddy current defect detection and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] The following is an example of a specific implementation case of the local corrosion defect detection of the U-shaped probe body 01 on the inspected stainless steel plate 34:

[0086] (1) The material of the tested stainless steel plate 34 is 304L stainless steel, the electrical conductivity is 1.379MS / m, and the relative magnetic permeability is 1.003. In the experiment, a piece of processing with 30×30×1.5mm was used 3 (length x width x depth) square groove 500 x 500 x 5mm 3 The inspected stainless steel plate test piece 34, the prescription groove in the center of the inspected stainless steel plate 34 is used to simulate local corrosion defects of the steel plate.

[0087] (2) The U-shaped probe body 01 detects the stainless steel plate 34 to be inspected. The specific parameters of the excitation coils of the two probes are shown in Table 1, and the detection coils of the two probes use better parameters. A current of 1.50A was passed through the first exciting c...

Embodiment 2

[0095] The parameters of the cylindrical probe body 02 for detecting localized corrosion defects are the same as those of the U-shaped probe body 01 in Example 1, and the stainless steel plate 34 to be inspected is tested again.

[0096] Considering the detection object and the lift-off distance, the time window range of No. 4-6 in the computer that can better identify the defect signal is selected to display the detection results, such as Figure 23 Shows the test results under 20mm lift-off, Figure 24 Test results at a lift-off of 30 mm are shown. Local defects can be well identified by using the asymmetrical double V-shaped waveform signal features.

Embodiment example

[0099] (1) The material of the test piece used is 304L stainless steel, the electrical conductivity is 1.379MS / m, and the relative magnetic permeability is 1.003. In the experiment, 34 specimens of 6 inspected stainless steel plates were used, each of which was 4 pieces of 500×500×2mm 3 (length×width×thickness), 2 pieces 500×500×1mm 3 The inspected stainless steel plate 34. The inspected stainless steel plates 34 with different thicknesses are used to simulate the change of the wall thickness of the steel plates.

[0100] (2) The probe detects the inspected stainless steel plates 34 with different thicknesses. The parameters of the U-shaped probe body 01 are consistent with Table 1, and the excitation current and frequency are also consistent with Embodiment 1.

[0101] (3) Place the U-shaped probe body 01 at the center of the inspected stainless steel plate 34 for detection. There is a coating layer 35 with a thickness of 100mm between the U-shaped probe body 01 and the ins...

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Abstract

According to a focusing probe for metal component eddy current defect detection and the using method thereof, an opening of a U-shaped magnetic core is vertically downward, first exciting coils are wound around the middle of the U-shaped magnetic core and the middle sections of two feet respectively, and a second exciting coil is wound around the periphery of a cylindrical magnetic core, and second detection coils are respectively arranged at the upper and lower ends of two sides symmetrical with the central axis of the second excitation coil. The excitation coil is connected with the pulse signal transmitter; the detection coil is connected with the detection signal receiver; and drawing voltage attenuation curve graphs of different time windows according to attenuation voltage data received by the computer by taking time as a horizontal coordinate and taking normalized induced voltage as a vertical coordinate, so as to judge local corrosion and wall thickness conditions of the test piece. The local defect and thickness of the stainless steel plate to be detected can be effectively detected under the long-term condition of large lift-off height, higher detection sensitivity is achieved, and the method has large application value in detection of local corrosion and wall thickness of metal components of pipelines with coating layers.

Description

technical field [0001] The invention belongs to the field of electromagnetic non-destructive testing, and in particular relates to a focusing probe for detecting eddy current defects of metal components with cladding layers and a method for using the same. Background technique [0002] Under the conditions of high temperature, high pressure and transportation of corrosive liquid and gas media, the pipelines of pressure equipment are prone to corrosion, and the corrosion is mainly localized. In order to keep warm and prevent external corrosion of the pipeline, a cladding layer with a thickness of tens to hundreds of millimeters is often used to protect the pipeline. Therefore, it is of great significance to detect the wall thickness reduction and localized corrosion of metal components without removing the cladding layer. [1-] . [0003] Pulsed eddy current testing technology (PECT) is a non-contact testing method that can detect metal components without removing the coatin...

Claims

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Application Information

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IPC IPC(8): G01N27/90
CPCG01N27/9006Y02E30/30
Inventor 付跃文陶爱军邢仁飞黄文丰杨帆余兆虎
Owner NANCHANG HANGKONG UNIVERSITY
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